I'm in the process of designing a message board for my family using ESP32/Arduino and a display. I want my family to be able to post reminders, groceries, etc. from anywhere (i.e. not on the same wifi connection). I would write an Android app to this end, but my family has iOS devices. What apps could I use as a front-end for my family to easily update the ESP32 server without them needing to know the technical details? Any suggestions are greatly appreciated.